Karn, Silver Golem [Arena League 1999] Commander Anthology Volume II Set: Portal Three Kingdoms Type:

Set: Portal Three Kingdoms Type: Sorcery Rarity: Uncommon Cost: {1}{R} Rockslide Ambush deals damage to target creature equal to the number of Mountains you control

Set: Shards of Alara Type: Instant Rarity: Rare Cost: {3}{B}{B} Reveal the top card of your library and put that card into your hand

Enchanted land is a Swamp

Set: Modern Masters Type: Instant — Arcane Rarity: Uncommon Cost: {1}{R} Add {R}{R}{R}

it gets -4/+4 until end of turn

Karn, Silver Golem [Arena League 1999] Commander Anthology Volume II Set: Portal Three Kingdoms Type:Set: Arena League 1999 Type: Legendary Artifact Creature Golem Rarity: Rare Cost: {5} Whenever Karn, Silver Golem blocks or becomes blocked, it gets 4 +4 until end of turn. {1}: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn.